Air-compressor pump



G. AND C. BURD.

AIR COMPRESSOR PUMP.

APPLICATION FILED OCT. 27. 1919.

Pat nted July 13, 1920.

k\ N -m\ m Q 311 UNITED TE? PAT NT 1 To all whom it concern:

Be it known that we, GEoRcn Bonn and CHARL S BURD, citizens of theUnited States,

residing at Detroit, in the county of Wayne and Stateof Michigan, haveinvented certain new and useful Improvements'in Air- Compressor Pumps,of which the following is a specification, reference being had thereinto the accompanying drawing.

This invention relates to improvements in air compressorpumps, andparticularly'to improvements upon our alr compressor pump of U. S.Patent No. 1,273,728, dated July 23rd, 1918, and is adapted to be usedeither as-a single or double compresson- Among the objects of ourinvention are 1. Providing a double walled cylinder in which the spacebetween the walls is subjected to the cooling eifect of air drawn intothe space by movement of the pistons.

"' 2. Providing an annular double'j walled cylinder in which the -wallsare held in working position by a novel cylinder frame carrying thecylinder head, cylindenring and a pacln'ng for the walls of thereciproeating piston. v

' 3. Providing a compressor composed of oppositely extending hollowpistons adapted to enter annular cylinders alternately for compressingthe air in first one hollow piston and then the other.

'14. Providing an air compressorcompris- 'ingan annular cylinderand ahollow piston cooperating with the inwardly projecting head of thecylinder for compressingthe air,

the wall of the cylinderhaving a thickness less than the width'of theannular cylinder in cylinder provided with apacking engagingthe'interior and exterior ofthe wallof the hollow piston, wherebyfriction occurs only at the point of the packing, thus reducing thetendency to heat up, and means whereby the hollow piston is exposed tothe air at each stroke to be cooled.

5. Providingfa structure in which a hollowjopen ended piston, acts as anair-compressor in conjunction with an annular form of cylinder, thehollow piston telescoping the projecting head of the annular cylinder,thus compressing the air in the hollow piston, whereby a simpleconstruction is provided and; one that is capable of easy repair.

Other and more specific objectsof the invention will appear from, thefollowing description. I

which it enters and the open inner end of the head and walls,

.thereby providing a ,9, to the GEORGE BURI) Ann CHARLES Bonn, ornnrnorr, MICI-IIG'rA1\T'. 1 p nm-comrnnsson rnMr... Y i T iSpecification of Letters Patent. IatentedPJllly 13, 1920, Applicationfiled bctober 27,4919. Serial lto. 333,ss1.

F1g. 2 is an enlarged horizontal sectional view of one of the cylindersshowingcthe supporting frame, piston packing, cylinder cylinder ring andthe means for h OldIIIg and adjusting the same in their workingposition. i

f orm'of a double compressor, but our inventlon is adapted for usev inasingle acting compressor.

n our invention, A represents an annular ton; C represents a cylindersupporting frame, and D represents a driving means for c cross-sectionthan the inner member .2, and piston receiving space 3.

, Upon the outer ends of the members 1 and 2, an annular member 4 isplaced which has in its 'inner'side two shoulders 5 and 6,. whichreceive the ends of the members 1 and 2 respectively, and is providedwith an opening 7 'for the insertion of the hand into the interiorof-the cylinder A; i

, cylinder; B represents'a hollow annular pisthe annular cylinder*A,andf2 is thefinner annular wall.

pressor pump cylinder, being of agreater I A cylinder head a, composedof two plates 1 8 and 8' is provide'd'with an inlet air-valve piston B,and an outlet air valve 10 through which the compressed air .isforcedthrough the pipe] 11 to a tank ."(=not shown) and rests upon the innerendof the inner wall 2 of the annular cylinder A. The inner plate 8', ofthe" cylinder head a, isprovided with ashoulder 12, upon which it restson theinner end of the inner wall2, of the cylinder A. A, V-shapedgroove 13 is formed in the edgeof the cylinder headtoreceive suitablepacking 14.

a A cylinder ring 5, formed ,of two annular plates 15 and 15' isprovided with a shoulder 16, upon which it rests'upon the inner end ofthe'outer wall 1, of the cylinder A, 1 This ring 6 has aV-shaped groove17in its inner edge V in which it carries a suitable packing-18. v

Twobolts 19 reach from the outeredge 20 4, along'the'out'side thecylinder A to of the annular member ef the 91. 9%} Wall 9? 6 5 e hereshow .our improvement in the the ring I) and are provided with suitablenuts 21.

Two bolts 22 reachfrom the inner edge23 of the annular member 4: to thecylinder head a and are provided with suitable nuts 24.

'VVhen the nuts 21 and 2%l are tightened down, the cylinder frame 0clamps the cylinder walls 1 and 2 and cylinder head a tightly into placeand workingposition. At the same time the packings ll and 18 are forcedtoward 'each other and into the piston space 3; The piston B is of a'cylindrical open ended shape a'nd'is constructed to have its walls 25reciprocate within the space 3, and has a piston head '26 across thecenter of the piston B, which is held in place by two screw-pintles 27The wall 25 of the hollow piston B is made thinner than the annularspace 3, whereby the piston may move back and forth therein withoutengaging the walls of the annular cylinder A. As will be readilyunderstood, the piston wall 25 touches only upon the packing 14 and 18,which provides an air-tight fit between the piston wall 25 and theopening 3 of the cylinder A. As will also be understood, the packing canbe tightened upon the piston wall 25, by tightening down upon the nuts21 and 24. Air openings 28, through the annular member 4: into thepiston space, 3, provide a cooling means for the piston wall 25. Themovement of the piston causes a constant circulation of air in the space3.

The hollow piston can be reciprocated in any suitable manner. The wayshown, however, consists in one end of a pitman or link 291beingswivelly connected to the pintles 27, as at 30. The other end ofthelinks 29 are swiveled at'the points 31 to the crank arms 32, whichare connected to a suitable crank shaft 33; This crank shaft 33 may bedriven in any suitable manner, but, as here shown, it ls'provided with agear wheel 34, geared to a wheel 35 carried by a suitable drive shaft36; This driveshaft 36 may be driven 'by'any form of power (not shown)such as a steam engine, an electric engine or explosive engine. 7

As in our Patent #1,273,728, thus far We have'desc'ribed only a singlecompressor em bodying our invention, and that may be driven differentlyfrom the manner here shown without affecting the invention here ininvolved. However, our improvement involves providing the piston headwith two hollow pistons, which extend in opposite directions andpreferably directly in a line withreaeh otherand 'cotiperating with anannular cylinder, the same as that heretofore described, and since thehollow pistons and theannular cylinders are exactly alike, it isunnecessary to repeat the description heretofore given of onecompressor, and the same reference letters are applied to both pistonsand both cylinders, the improvement being the novel form of cylinderframe fora cylinder composed of two separate open endedcylindrical-shaped members, cooling means for the piston space betweenthe cylinder walls and a two-piece cylinder head andring, so constructedto receive piston packing that the tightening of the cylinder frame willtighten the packingagainst the piston wall. p v f By this constructionbotlrtlie inner and outer walls 1 and 2 of the cylinder A, and thepiston Wall 28 are subjected to" the cooling effect of the surroundingair, and thus materially assist in preventing the overheating of'thecompressor in operation.

The compressor can be mounted on any suitable base or support, but themeans here shown consists of providing the rings land b with perforatedears 37, through whic bolts may be passed for clamping the compressor toa suitable block or base.

Having thus described our invention, what we claim and desire to secureby Letters Patent is:

1. In an air compressor of the character described, a cylindercomprising separatev parallel'inner and outer cylindricalwalls arrangedin separated relation, a separate cylinder head closing one end of theinner cylindrical wall, a clamping ring surro n ing-the inner end, ofthe outer cylindrical wall and abutting against its inner end, aclamping ring embracing and abutting against the outer ends of bothcylindrical walls, bolts connecting both therings outside of the outercylindrical wall and connecting the outerring' and the cylinder head andclamping the walls in their operative positions. and a hollowpistonoperativeh tweensaid walls, for the purpose described.

"2.111 an air compressor of the character described, a cylindercomprising separate inner and outer parallelcylindrical wa ls, arrangedin separated relation, 'aic'ylinder headp rovided with inlets andoutlets clo ingfoneend of theinner cylindri'al wall, a clampingring'provided with a shoulder and an outwardly projecting edge embracingthe adjacent end of the outer cylindrical wall, a clamping ring providedwith iiiwardly and outwardly projecting, edges I withintermediateshoulders embracing opposite ends of both cylindrical'walls, clamping bolts connecting the outwardly projecting edges of therings, clamping bolts embraced within the inner 'cy indri'cal wall andconnecting the cylinder head and i i the inner projecting edges of thetwo shouldered rings, and a piston operative between the cylindricalwalls, for the purpose described.

3. In an air compressor, a cylinder comprising separate parallel innerand outer cylindrical walls arranged in separated relation, a splitcylinder head provided with inlets and outlets closing one end of theinner cylindrical wall, a split clamping ring provided with a shoulderand an outwardly projecting edge embracing the adjacent end of the outercylindrical Wall, a clamping ring provided with inwardly and outwardlyprojecting edges with intermediate shoulders and an air opening to thespaced cylindrical walls, embracing the opposite ends of bothcylindrical walls, clamping bolts connecting the outwardly projectingedges of the rings, clamping bolts embraced within the inner cylindricalwall connecting the split cylinder head and the inner projecting edge ofthe two shouldered ring, packing carried by the adjacent splitperipheral edges of the cylinder head and vthe adjacent ring and beingforced toward each other when the clamping bolts are tight-' ened, and ahollow piston operative between the cylindrical 4. An air compressorcomprising two oppositely arranged open ended cylinders po sitioned faceto face and each cylinder comprising separate inner and outer parallelwalls forming between them a piston space, the inner ends of theinnercylinder walls closed by cylinder heads, each head having airinlets and outlets, a hollow piston consistingof an open ended tubewithits opposite ends movable in said piston spaces, a separate pistonhead within the hollow piston and secured therein intermediate its ends,pintles extending laterally through the hollow piston and within thepiston head, and piston operating means connected with the projectingends of the pintles, the parts operating as described.

In testimony whereof we hereunto aflix our signatures.

, GEORGE BURD.

CHARLES onn.

